utils/glcanvas/gtk/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        glcanvas.cpp
   3 // Purpose:     wxGLCanvas, for using OpenGL/Mesa with wxWindows and GTK
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     17/08/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "glcanvas.h"
  14 #endif
  15
  16 #include "glcanvas.h"
  17
  18 #include "wx/frame.h"
  19 #include "wx/colour.h"
  20 #include "wx/module.h"
  21 #include "wx/app.h"
  22
  23 extern "C" {
  24 #include "gtk/gtk.h"
  25 #include "gdk/gdk.h"
  26 #include "gdk/gdkx.h"
  27 }
  28
  29 #include "wx/gtk/win_gtk.h"
  30
  31 //---------------------------------------------------------------------------
  32 // global data
  33 //---------------------------------------------------------------------------
  34
  35 XVisualInfo *g_vi = (XVisualInfo*) NULL;
  36
  37 //-----------------------------------------------------------------------------
  38 // idle system
  39 //-----------------------------------------------------------------------------
  40
  41 extern void wxapp_install_idle_handler();
  42 extern bool g_isIdle;
  43
  44 //---------------------------------------------------------------------------
  45 // wxGLContext
  46 //---------------------------------------------------------------------------
  47
  48 IMPLEMENT_CLASS(wxGLContext,wxObject)
  49
  50 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
  51 {
  52     m_window = win;
  53     m_widget = win->m_wxwindow;
  54
  55     wxGLCanvas *gc = (wxGLCanvas*) win;
  56     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  57
  58     wxCHECK_RET( vi, "invalid visual for OpenGl" );
  59
  60     m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
  61
  62     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  63 }
  64
  65 wxGLContext::wxGLContext(
  66                bool WXUNUSED(isRGB), wxWindow *win,
  67                const wxPalette& WXUNUSED(palette),
  68                const wxGLContext *other        /* for sharing display lists */
  69 )
  70 {
  71     m_window = win;
  72     m_widget = win->m_wxwindow;
  73
  74     wxGLCanvas *gc = (wxGLCanvas*) win;
  75     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  76
  77     wxCHECK_RET( vi, "invalid visual for OpenGl" );
  78
  79     if( other != 0 )
  80         m_glContext = glXCreateContext( GDK_DISPLAY(), vi, other->m_glContext, GL_TRUE );
  81     else
  82         m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
  83
  84     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  85 }
  86
  87 wxGLContext::~wxGLContext()
  88 {
  89     if (!m_glContext) return;
  90
  91     if (m_glContext == glXGetCurrentContext())
  92     {
  93         glXMakeCurrent( GDK_DISPLAY(), None, NULL);
  94     }
  95
  96     glXDestroyContext( GDK_DISPLAY(), m_glContext );
  97 }
  98
  99 void wxGLContext::SwapBuffers()
 100 {
 101     if (m_glContext)
 102     {
 103         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 104         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
 105     }
 106 }
 107
 108 void wxGLContext::SetCurrent()
 109 {
 110     if (m_glContext)
 111     {
 112         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 113         glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
 114     }
 115 }
 116
 117 void wxGLContext::SetColour(const char *colour)
 118 {
 119     float r = 0.0;
 120     float g = 0.0;
 121     float b = 0.0;
 122     wxColour *col = wxTheColourDatabase->FindColour(colour);
 123     if (col)
 124     {
 125         r = (float)(col->Red()/256.0);
 126         g = (float)(col->Green()/256.0);
 127         b = (float)(col->Blue()/256.0);
 128         glColor3f( r, g, b);
 129     }
 130 }
 131
 132 void wxGLContext::SetupPixelFormat()
 133 {
 134 }
 135
 136 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 137 {
 138 }
 139
 140 wxPalette wxGLContext::CreateDefaultPalette()
 141 {
 142     return wxNullPalette;
 143 }
 144
 145 //-----------------------------------------------------------------------------
 146 // "realize" from m_wxwindow
 147 //-----------------------------------------------------------------------------
 148
 149 static gint
 150 gtk_glwindow_realized_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 151 {
 152     win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, win->m_sharedContext );
 153
 154     return FALSE;
 155 }
 156
 157 //-----------------------------------------------------------------------------
 158 // "map" from m_wxwindow
 159 //-----------------------------------------------------------------------------
 160
 161 static gint
 162 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 163 {
 164     if (win->m_glContext/* && win->m_exposed*/)
 165     {
 166         wxPaintEvent event( win->GetId() );
 167         event.SetEventObject( win );
 168         win->GetEventHandler()->ProcessEvent( event );
 169
 170         win->m_exposed = FALSE;
 171         win->GetUpdateRegion().Clear();
 172     }
 173
 174     return FALSE;
 175 }
 176
 177 //-----------------------------------------------------------------------------
 178 // "expose_event" of m_wxwindow
 179 //-----------------------------------------------------------------------------
 180
 181 static void
 182 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
 183 {
 184     if (g_isIdle)
 185         wxapp_install_idle_handler();
 186
 187     win->m_exposed = TRUE;
 188
 189     win->GetUpdateRegion().Union( gdk_event->area.x,
 190                                   gdk_event->area.y,
 191                                   gdk_event->area.width,
 192                                   gdk_event->area.height );
 193 }
 194
 195 //-----------------------------------------------------------------------------
 196 // "draw" of m_wxwindow
 197 //-----------------------------------------------------------------------------
 198
 199 static void
 200 gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
 201 {
 202     if (g_isIdle)
 203         wxapp_install_idle_handler();
 204
 205     win->m_exposed = TRUE;
 206
 207     win->GetUpdateRegion().Union( rect->x, rect->y,
 208                                   rect->width, rect->height );
 209 }
 210
 211 //-----------------------------------------------------------------------------
 212 // "size_allocate" of m_wxwindow
 213 //-----------------------------------------------------------------------------
 214
 215 static void
 216 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
 217 {
 218     if (g_isIdle)
 219         wxapp_install_idle_handler();
 220
 221     if (!win->m_hasVMT)
 222         return;
 223
 224     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 225     event.SetEventObject( win );
 226     win->GetEventHandler()->ProcessEvent( event );
 227 }
 228
 229 //---------------------------------------------------------------------------
 230 // wxGlCanvas
 231 //---------------------------------------------------------------------------
 232
 233 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 234
 235 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 236     EVT_SIZE(wxGLCanvas::OnSize)
 237 END_EVENT_TABLE()
 238
 239 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 240                         const wxPoint& pos, const wxSize& size,
 241                         long style, const wxString& name,
 242                         int *attribList,
 243                         const wxPalette& palette )
 244 {
 245     Create( parent, NULL, id, pos, size, style, name, attribList, palette );
 246 }
 247
 248 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 249                         const wxGLContext *shared,
 250                         wxWindowID id,
 251                         const wxPoint& pos, const wxSize& size,
 252                         long style, const wxString& name,
 253                         int *attribList,
 254                         const wxPalette& palette )
 255 {
 256     Create( parent, shared, id, pos, size, style, name, attribList, palette );
 257 }
 258
 259 bool wxGLCanvas::Create( wxWindow *parent,
 260                          const wxGLContext *shared,
 261                          wxWindowID id,
 262                          const wxPoint& pos, const wxSize& size,
 263                          long style, const wxString& name,
 264                          int *attribList,
 265                          const wxPalette& palette)
 266 {
 267     m_sharedContext = (wxGLContext*)shared;  // const_cast
 268     m_glContext = (wxGLContext*) NULL;
 269
 270     m_exposed = FALSE;
 271     m_noExpose = TRUE;
 272     m_nativeSizeEvent = TRUE;
 273
 274     if (!attribList)
 275     {
 276         int data[] = { GLX_RGBA,
 277                        GLX_DOUBLEBUFFER,
 278                        GLX_DEPTH_SIZE, 1,  // use largest available depth buffer
 279                        GLX_RED_SIZE, 1,
 280                        GLX_GREEN_SIZE, 1,
 281                        GLX_BLUE_SIZE, 1,
 282                        GLX_ALPHA_SIZE, 0,
 283                        None };
 284         attribList = (int*) data;
 285     }
 286     else
 287     {
 288       int data[512], arg=0, p=0;
 289
 290       while( (attribList[arg]!=0) && (p<512) )
 291       {
 292         switch( attribList[arg++] )
 293         {
 294           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 295           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 296           case WX_GL_DEPTH_SIZE:
 297             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 298           case WX_GL_MIN_RED:
 299             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 300           case WX_GL_MIN_GREEN:
 301             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 302           case WX_GL_MIN_BLUE:
 303             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 304           default:
 305             break;
 306         }
 307       }
 308       data[p] = 0;
 309
 310       attribList = (int*) data;
 311     }
 312
 313
 314     Display *dpy = GDK_DISPLAY();
 315
 316     XVisualInfo *vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 317
 318     m_vi = vi;  // safe for later use
 319
 320     wxCHECK_MSG( m_vi, FALSE, "required visual couldn't be found" );
 321
 322     GdkVisual *visual = gdkx_visual_get( vi->visualid );
 323     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(vi->visualid), TRUE );
 324
 325     gtk_widget_push_colormap( colormap );
 326     gtk_widget_push_visual( visual );
 327
 328     wxScrolledWindow::Create( parent, id, pos, size, style, name );
 329
 330     m_glWidget = m_wxwindow;
 331
 332     gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );
 333
 334     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
 335                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 336
 337     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "map",
 338                             GTK_SIGNAL_FUNC(gtk_glwindow_map_callback), (gpointer) this );
 339
 340     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
 341         GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
 342
 343     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
 344         GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
 345
 346     gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
 347         GTK_SIGNAL_FUNC(gtk_glcanvas_size_callback), (gpointer)this );
 348
 349     gtk_widget_pop_visual();
 350     gtk_widget_pop_colormap();
 351
 352     return TRUE;
 353 }
 354
 355 wxGLCanvas::~wxGLCanvas()
 356 {
 357     XVisualInfo *vi = (XVisualInfo *) m_vi;
 358
 359     if (vi)
 360         XFree( vi );
 361
 362     if (m_glContext) delete m_glContext;
 363 }
 364
 365 void wxGLCanvas::SwapBuffers()
 366 {
 367     if (m_glContext) m_glContext->SwapBuffers();
 368 }
 369
 370 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 371 {
 372     int width, height;
 373     GetClientSize( &width, &height );
 374
 375     if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
 376     {
 377         SetCurrent();
 378
 379         glViewport(0, 0, (GLint)width, (GLint)height );
 380         glMatrixMode(GL_PROJECTION);
 381         glLoadIdentity();
 382         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 383         glMatrixMode(GL_MODELVIEW);
 384     }
 385 }
 386
 387 void wxGLCanvas::SetCurrent()
 388 {
 389     if (m_glContext) m_glContext->SetCurrent();
 390 }
 391
 392 void wxGLCanvas::SetColour( const char *colour )
 393 {
 394     if (m_glContext) m_glContext->SetColour( colour );
 395 }
 396
 397 void wxGLCanvas::OnInternalIdle()
 398 {
 399     if (m_glContext && m_exposed)
 400     {
 401         wxPaintEvent event( GetId() );
 402         event.SetEventObject( this );
 403         GetEventHandler()->ProcessEvent( event );
 404
 405         m_exposed = FALSE;
 406         GetUpdateRegion().Clear();
 407     }
 408
 409     wxWindow::OnInternalIdle();
 410 }